1. Ultrastrong tunable coupler between superconducting LC resonators
- Author
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Miyanaga, Takafumi, Tomonaga, Akiyoshi, Ito, Hikaru, Mukai, Hiroto, and Tsai, Jaw-Shen
- Subjects
Quantum Physics ,Condensed Matter - Superconductivity - Abstract
We investigate the ultrastrong tunable coupler for coupling of superconducting resonators. Obtained coupling constant exceeds 1 GHz, and the wide range tunability is achieved both antiferromagnetics and ferromagnetics from $-1086$ MHz to 604 MHz. The ultrastrong coupler is composed of rf-SQUID and dc-SQUID as tunable junctions, which connected to resonators via shared aluminum thin film meander lines enabling such a huge coupling constant. The spectrum of the coupler obviously shows the breaking of the rotating wave approximation, and our circuit model treating the Josephson junction as a tunable inductance reproduces the experimental results well. The ultrastrong coupler is expected to be utilized in quantum annealing circuits and/or NISQ devices with dense connections between qubits., Comment: 12pages, 7 figures
- Published
- 2021
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